diff --git a/lib/lcm.c b/lib/lcm.c
index 157cd88..10b5cfc 100644
--- a/lib/lcm.c
+++ b/lib/lcm.c
@@ -1,6 +1,7 @@
 #include <linux/kernel.h>
 #include <linux/gcd.h>
 #include <linux/module.h>
+#include <linux/lcm.h>
 
 /* Lowest common multiple */
 unsigned long lcm(unsigned long a, unsigned long b)